chore: update "generateSignalPubKey" function

src/Utils/crypto.ts

@@ -1,6 +1,7 @@
 import { createCipheriv, createDecipheriv, createHash, createHmac, randomBytes } from 'crypto'
 import * as curveJs from 'curve25519-js'
 import HKDF from 'futoin-hkdf'
+import { KEY_BUNDLE_TYPE } from '../Defaults'
 import { KeyPair } from '../Types'
 
 export const Curve = {
@@ -22,12 +23,14 @@ export const Curve = {
 		return curveJs.verify(pubKey, message, signature)
 	}
 }
+/** prefix version byte to the pub keys, required for some curve crypto functions */
+export const generateSignalPubKey = (pubKey: Uint8Array | Buffer) => (
+	Buffer.concat([ KEY_BUNDLE_TYPE, pubKey ])
+)
 
 export const signedKeyPair = (keyPair: KeyPair, keyId: number) => {
 	const signKeys = Curve.generateKeyPair()
-	const pubKey = new Uint8Array(33)
-	pubKey.set([5], 0)
-	pubKey.set(signKeys.public, 1)
+	const pubKey = generateSignalPubKey(keyPair.public)
 
 	const signature = Curve.sign(keyPair.private, pubKey)
 

src/Utils/signal.ts

@@ -4,16 +4,9 @@ import { GroupCipher, GroupSessionBuilder, SenderKeyDistributionMessage, SenderK
 import { KEY_BUNDLE_TYPE } from '../Defaults'
 import { AuthenticationCreds, AuthenticationState, KeyPair, SignalAuthState, SignalIdentity, SignalKeyStore, SignedKeyPair } from '../Types/Auth'
 import { assertNodeErrorFree, BinaryNode, getBinaryNodeChild, getBinaryNodeChildBuffer, getBinaryNodeChildren, getBinaryNodeChildUInt, jidDecode, JidWithDevice, S_WHATSAPP_NET } from '../WABinary'
-import { Curve } from './crypto'
+import { Curve, generateSignalPubKey } from './crypto'
 import { encodeBigEndian } from './generics'
 
-export const generateSignalPubKey = (pubKey: Uint8Array | Buffer) => {
-	const newPub = Buffer.alloc(33)
-	newPub.set([5], 0)
-	newPub.set(pubKey, 1)
-	return newPub
-}
-
 const jidToSignalAddress = (jid: string) => jid.split('@')[0]
 
 export const jidToSignalProtocolAddress = (jid: string) => {